Used for debug only.
| RCV_DELAY | Device - register the received data to account for hub bit dribble before EOP. Only affects certain hubs. |
| LINESTATE_DELAY | Device/Host - add an extra 1-bit debounce of linestate sampling. |
| MULTI_HUB_FIX | Host - increase inter-packet and turnaround timeouts to accommodate worst-case hub delays. |
| DEV_BUFF_CONTROL_DOUBLE_READ_FIX | Device - the controller FSM performs two reads of the buffer status memory address to avoid sampling metastable data. An enabled buffer is only used if both reads match. |
| SIE_RX_BITSTUFF_FIX | RX - when a bitstuff error is signalled by rx_dasm, unconditionally terminate RX decode to avoid a hang during certain packet phases. |
| SIE_RX_CHATTER_SE0_FIX | RX - when recovering from line chatter or bitstuff errors, treat SE0 as the end of chatter as well as 8 consecutive idle bits. |
| DEV_RX_ERR_QUIESCE | Device - suppress repeated errors until the device FSM is next in the process of decoding an inbound packet. |
| DEV_LS_WAKE_FIX | Device - exit suspend on any non-idle signalling, not qualified with a 1ms timer |
| SPARE_FIX |